Package: udev
Version: 153-2
Severity: normal
Tags: patch
When /etc/network/interfaces has an allow-hotplug interface like
allow-hotplug eth0
iface eth0 inet dhcp
then udev calls ifup, via the /lib/udev/net.agent script on that
interface when it is discovered. But udev helper scripts all run at
nice priority -2 (see the UDEV_PRIORITY #define in udev/udevd.c, and the
call to setpriority() in worker_new()). This would be fine, except that
ifup can start long-running daemons like dhclient3, and it runs all the
scripts in /etc/network/if-up.d, and at least one of those
(openssh-server) runs a daemon's init script with the "restart" target.
This results in some daemons like sshd and dhclient3 running with nice
priority -2.
I don't believe this is an intended effect - I certainly didn't expect
sshd (and hence all processes started or services restarted by a user
ssh-ing in) to run at an elevated scheduling priority. The following
patch to net.agent causes it to set its nice priority to 0 before trying
to do anything else.
--- net.agent.orig 2010-05-11 14:50:38.000000000 -0600
+++ net.agent 2010-05-11 14:57:18.000000000 -0600
@@ -3,6 +3,10 @@
# run /sbin/{ifup,ifdown} with the --allow=hotplug option.
#
+# Since running ifup can result in restarting daemons, we should reset our nice
+# priority
+renice -n 0 $$
+
. /lib/udev/hotplug.functions
if [ -z "$INTERFACE" ]; then
-- System Information:
Debian Release: squeeze/sid
APT prefers testing
APT policy: (500, 'testing')
Architecture: amd64 (x86_64)
Kernel: Linux 2.6.32-3-amd64 (SMP w/16 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Versions of packages udev depends on:
ii debconf [debconf-2.0] 1.5.32 Debian configuration management sy
ii libc6 2.10.2-6 Embedded GNU C Library: Shared lib
ii libselinux1 2.0.94-1 SELinux runtime shared libraries
ii libusb-0.1-4 2:0.1.12-14 userspace USB programming library
ii lsb-base 3.2-23.1 Linux Standard Base 3.2 init scrip
ii util-linux 2.16.2-0 Miscellaneous system utilities
Versions of packages udev recommends:
ii pciutils 1:3.1.7-3 Linux PCI Utilities
ii usbutils 0.87-1+b1 Linux USB utilities
udev suggests no packages.
-- debconf information:
udev/new_kernel_needed: false
udev/title/upgrade:
udev/reboot_needed:
--
+-----------------------------------------+
| John Wright <john.wri...@hp.com> |
| Hewlett-Packard Telco Platform Software |
+-----------------------------------------+
--
To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org
with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org
